Sound-producing device



F, Jl. KEHNI" ET 'AL SOUND PRQDUGING DEVICE June M. w;

shed 001;. 9, 19211t 2 shwtsnsnm, l

LESZ@ F, J. KAEHNI ET AL. SOUND PRODUCIG DEVICE 2 Sheotsshem 2 Filed Oct. 9, 1924 Q/ ze ippiieeeion mm3. Mtebei' f., .13%.

` The principal object ei this inventionis m erodnee a s-xnpie effective inegneftie dei/lee foi.: 'use in Combination with the iepioelueer nieelaanisni, of u. phonograph nini responsive to variations in eeeric cura'enu through the device, io time produce sound by the conse 'queue eetuationv'of fue repiodueei die; piuegni, the eenneeion between the repen einem* meeimnism and fixe magnetic deeiee lne ing preferably Through the usual needle ei he phonograph.

'ilie pesent' invention constitutes 'en imprfovenent'upon the inventions directed io elle seine pumpose sind shown., described and .claimed in the prior application of .Frank J. Kaell'ni and Vini. L. KaehniNo. .561.,415

xiled Mey 16, i922,

.. granted! August 22nd,'- 1922 to seid Kaeimi A im 'enel Keenni.-

Among other objects of the un rovements 0f the plesene ap lvleetion is tie eccompiisluueul of rie-pro( Action-o eonipeentiveiy large 'volume oit' sound whileobtaining :i

sweei ilue qunliijv, due in more necuieee and i'niflli'ui i'epzoiiueion of the eeieionsoi infront throng-'l1 alle magneec device. More specific obuiees inelude lie arrange ment of the .device in :i eonipeet forni that i may easily be placed in the proper posi- 2ion on-smndnijol types ei phenny-upbeat [he side otlie ijeeoid ceirying uble oin on the record eeri'ying elie, iu e posi-tion to v receive elle needie oi' elle phonograph. wihn out requiring any change in the reproflucer puiS. 'I v in curi-ying out our present invention, we prefer to utilize a vibrating member in #the-` nature of z1- reed of magnetic materiel ees'ponsive "to `n weak nuigneiefielkl. it renchesflaiglier magnetic density for given amountl of electrical energy `eiezitng the vnlelgnmic ielg-tluin materials usually used.

'lhait beconiemnoie nmguetie in 'n given magnetic field than soft iron or siiieon iion. A mueriul found very suiuble for our pres ent purpose is an alloy of i/7U nickel und will; iron. The use of liis materiel in such ellls 'forms the subject mutter of an applicatonof Zay ei'ries, lle'd etober 6, 19:24. Serial No. 7322.078.

@ther objects endedvanngee oi the present invenion will become apenient from lie following Specification end elle essentiel und Patent No. 1,426,743.

"nl, ne eenvnieeni, @may in eine iiwings aig. l le .e perspective view of our device showing ehe eonneeing parts of the Mpx-oelneel' seyius., :nifl nee'le in normal opei'ning position; liig. fis :1 -per epee-tive View showing; ille easing ef eine eieviee removed; Bris e. pien or the Seme; Fig. e is e bottoni plan; iig. 53' ie n. vemieei transverse section on ein enleigeci seele; Fig'. i is e siiniiai' section righe .eugies with iig. 5:-, eine planes-o these sections being; indieetefi by *die .eoiiespenelingly :giesigimted iines of Fig. 2%; ligf is eeetionei denii also eninigeol showing eide menne? of eonf' meeting elle iuernni'eoiiwitli ieee?. Wie/e' The device' es' shown eonsisis primeeiiy of e base. on which is mounted e rnegne of per ticulaly nflaiped oonsieuetion., sind im e'ee tromngneliecoil through tiie eore of Wliieli Apasses l e vibieting member spliced apar?. fiom the siieeoumling nieuwe? and @inject in@ betweenlllie-peies o" elle magnet. The base poi-tion is indicated ne l0 end is pro- 'iifleel wili :i iiolvnwmdiy exieuiing; flange foaming' e rese. Atene center i5 an upweia iy pzfeieeting spool preferably.' negrel therewith sind iievng a flange. l. ne the upper end thereof, ihereby eonining wires of elle eoil -inciieexed' ne i5. The center portion Il of lie spool; is holow mul through it projects the viin'eing meineml 20.

This viineting member oi" ieei is eliown es mounte on 'the base by ineens of a ia spring 22 ifo wiiieii the ree@ isse'eu :is el: 23 enti lie ends o this spring are rovideii with openings through which protiu e screws 2i shown :is ln'ezided into bushings mounted in elle base. The busningsraie to provide suitable thread engagement iis the hase element is prefeinlly foi-'med oi' non-conduexing nmlerinl auch as laakelite.

The equvelentof e horse shoe magnet is :ozn'xed by seniwireulai members 32 Spaeefl upwardly fiorn elle brise by one oi more seinoings, as shown, mici the ends of ihesev nieuwere use clamped between slums ndicalled at 3G and the sector-shaped pole. pieces 35, tlii'ough Wlieii pase the screws 36y hreacled ino bushings 32'" 1n thebasej E will be'no'ted einen in piece of the semi-einzu; lar members 32., we niey gromde eomnlebe laminated rines i desired., .lane we neve' found. that better Contact between the laminations is attained by making 'the parts as shown, f

'As shown in Figs. 2 and 3, the sector pole pieces ypresent flattened faces 38 tojflat surfaces 2l o'l the reed Q0 normally standing slightly spaced. apart therefrom to allow for v the vibration movementand vet securing suitali le-cords 'commonly termed phone `cords, designated 4:3,have their binding trude up W the reed li'spositively moved,

clips clamped under the heads or' the screws 40. These cords.y ofcourse, are adapted toI lead the pulsating' or variable indio-frequency 'current to the coil 15, one of the most usual uses boing to connect them in circuit with a suitable audion of a radio receiving apparatus.

in order1 to strengthen the magnetic field through the reed7 We prefer-to form the spring portion of a ferromagnetic condoctor and sin'iilarlythe' screws 27,1. are of like material and as'shown, they may proardly to apoint adjacentthe ring members liorming the base ot' the magnet. ifhe poles are intermediate the two upwardly projecting screws and a magnetic tlux circuit is created through the reed, poles 35 and rings, returning across a slight air` gap to the screw lmembers 24. andthrough the spring member to the reed. Thus a flux circuit is formed through the poles and base portions of the magnet through a1 nentral point, at `the screws, to the other end olf-the reed. This intensifies the magnetic action upon` the reed, although it is not Vital to the operation of the device.`

The `reed as irulicatedalnn'e, is responsive a yery weak magnetic field, and of course, when the coil l5 is energized, the reed`becomes a'i magnetic har, so that as the current. through'the coil l5 is varied, the magnetic strength of the reed is correspoiulingly va`v Tied, and .it is attracted and repelled by the pole pieces r'hns we have variable magnetic strength in Jthe rccd which reacts with the strength of the permanent magnetic field to cause-it to move alternately toward vand away/,trom each pole in true synchronism with the variations in the current through the coil. This Ivibration according-` ly is an exact reproduction of the current input and the phonograph. needle resting in the notch or groove in the upper end of' very similarly to the\moveinen t givenY it by a record. Therefore, the electrical energy being trans.

fla/ted 'into transverse vibrations of the reed,

is mechanically and positively transmitted to the phonograph diaphragm producing the sound vibrations in the reproducer vbox and phonograph horn. f

lt is essential that' in combining this device witli the usual reproducer of a phono-V kducer diaphragm holder. However, if the result is not satisfactory, ural for one operating sets and the like to turn the device Slightly on its base until the best results are obtained,

it isIl equally natafter the manner of adjusting the dials of the receivingr set. If desired, indications may be made to assist in accurately positioning it.

The magnet and reed'are preferably enclosed except for the upper end of the need in acup shaped casing 60, shown as resting upon an offset shoulder on the base and p0- stitioncfl by the cylindrical portion shown above the' shoulder. Thel top of the cap or cup preferably has adepression allowing it to rest upon the magnet pole'v pieces t0 which it may be clamped by screws 62 threaded intothe pole pieces 35, as shown. This al'ords a convenient means for the lo: cation of a suitable name plate, indicated at G5. y The base is preferably closed by a disc T0 having felt or any snitabletacing indi- `cated at 72 to avoid :nari-ing thev surface on which it may be placed.' This is held in p0- sition by screws 74 beingfthreaded 'into' the bushings 3T the screw heads engaging upwardly beveled"flangessurrounding t-he open-; ings ior the screws, in order that the heads of the screws may be above the surface onwhich the device rests.

l.. The combination with a phonograph reprodncer having avroclrable stylus and sound reproducing diapln'agln, and a inagnetic device responsive toaudio-frequency variations in an electric circuit and consisting ot' a hase member, and a permanent magnet ol flat arcuate picces,pole members secured thereto to vform in ellect with the said pieces a continuous magnetic annulus and extending inwardly from such annulus, a vibrating member between the poles, an electromagnetic coil for'subjecting the vibrating member to variable magnetic flux, said vibratingmembcr adapted to be connected With the rockable stylus.`

2. The combination with the usual reproducing mechanism of a phonograph including t e stylus, of a means for translating variable electric current into mechanical vif brations including a vibnating -member adapted to be connectedto hause positive vlbratlon of the stylus, 'a laminated vmagnet radio receiving' lOz i positioning comprising an armature having arcuate portions surrounding said memberiand surmounted by inwardly projecting flat pole pieces, a base member hav,i ing a hollow upward projection through which said vibrating' member extends. means for resilientlyfl mounting a vibrating memb'er on the base, an electromagnetic coil on said projection, and means -for supplying "variable current to the coil.

3. In a'. sound reproducing device, the combination with a phonograph reproducer having a diaphragm, a needle engaging and means and a means for transating variations of an electric current into mechanical vibrations in said phonograph diaphragm including a base member of nonmagnetic material having the spool formed thereon, an electromagnetic coil on said spool formed thereon for creating a variable magnetic field responsive to variations in said current, a magnetic reed projecting through said spool and mounted to vibrate therein, a permanent magnet surrounding the' spool, the body of the magnet consisting of fiat ring members, and fiat pole pieces secured thereto and projecting inwardly to points adjacent the one end of the reed.

4. A device for actuating the reproduceil of the'pnonograph to producelsound including a vibrating member responsive to 'variations in an electric current and havin-g a non-magnetic base member formed with an upwardly projecting spool, a coil carried by the spool and .a permanent magnety consisting of iiat lammations surrounding the spool and flat pole pieces projecting inward- 1y over said coil, and a vibrating magnet the spool and to a point adjacentV the pole pieces, a resilient means disposed substantially at right angles to the vibrating member and secured to the base for carrying the vibratingx member, said vibrating member having t e property netic 1n a given weak tield'than soft' iron or silicon iron.

5. In a sound producing device, the coinbination of the'reproducer mechanism of a phonograph consisting of a base adapted to rest on the record table or at the side thereof and formed of non-metallic material id therewith,

and havinga hollow spool ri an electromagnetic coil on sai spool, a permanent magnet consisting of arcuate punch-l ings of flat ma netic metal secured to the base around said coll, sector-shaped pole `net to form a magnetic projecting through .brating member,

of becoming more mag.

pieces adjustably securedbpon said arcuate pieces and projecting inwardl and a v1- rating member adapted to be variably magnetized by said coil and reacting to ward and away lfrom the poles of the parma.- nent magnet.

6. In a device for translating variations in an electric current into mechanical vibryations, the combination of an electromagnet, a nononagnctic core and basesupporting the same, an arcuate permanent magnet mounted above the base,a coil* within the magnet, a reedprojectinflr loosely through the coil and actedY upon y the field of 'said coil, a support for the reed of resilient ferromagnetic material and securing means therefor of similar material projecting through the base to a point adjacent the permanent mag-.1.

flux circuit throug the reed and permanent magnet.

7. A magnetic sound producing device adapted to actuate the usual stylus of a.

phonograph having a sound reducing mechanism with a. vertical soun ing diaphragm consisting of a base member, a mag'- netic coil with a h'ollow center. and a 'v1- brating reed projecting upwardl through said coil, a magnet having a bo y portion surrounding they coil and having pole pieces adjacent the reed, a casing surrounding the magnet and fitted to the having two of its sides beveled to clear the lower edge of the phonograph sound box when the phonograph needle 1s resting uponv said vibrating member, the base being adapted to rest upon a record carryin table or base, said casing on a phonograph casing at the si e thereof.

magnetic sound adapted to coact with a p onograph sound box or the like, including a base and a via magnetic coil subjecting the vibrating member to a'magnetic flux, a ermanent magnet having its pole pieces adjacent the vibrating member and having its body portion annular and surrounding the coil, a-resiligl @support for the vibrating member ot erromagnetic material constif tutin a bridge member beneath the base, securing screws therefor, rejecting upwardly toward the magnet bo y, each at a point remote fromthe pole pieces.

In testimony whereof, wehereunto aii our signatures. A

FRANK J. KAEHNI. WILLIAM L. KAEHNI.

plroducing device 

